2. no, it his stupid felt pen

watch from about 18:00 on this and at the end when they show the documents - his signature is all huge and bold while theirs were just in regular ballpoint pen.

ok reading more comments it seems he did fuck up where he signed the first copy and Trudeau does the classy thing by not showing it to the camera. still the giant bold felt pen piss stain is embarrassing enough.

3. this comment was the best:

Trudeau and Peņa Nieto each have a normal pen, but Trump has a garish oversized sharpie to compensate for his odd little mushroom. And THEN he signs in the wrong place, asks Trudeau which one of the 3 is the "important copy", Trudeau tells him that all 3 are, Trudeau stares off while Curb Your Enthusiasm plays, then Peņa Nieto and Trump get to hold up their copies while Trudeau keeps his closed to cover for Trump's inability to sign next to his printed name. #winning﻿